 Improvised basslines typically outline the harmony of each chord by playing the root, third, seventh and fifth of each chord, and playing any other notes that the composer has requested in the chord (e.g., if the chord chart indicates a sixth chord on the tonic in C Major, the bassist might include the sixth degree of the C Major scale, an "A" note, in her/his bassline).The chordal instrument players improvise chords based on the chord progression.Chordal instrument players use jazz chord voicings that are different from those used in popular music and classical music from the common practice period.